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M. .l. BARNETT.

.TIMER.

APPLICATION FILED OCT. 24,1916.

Patented Aug. 12, 1919.

A TTORNE Y INVENTOR/ THE COLUMRIA PLANDGRAFH cc., WASHINGTON, D. c.

. onRIssoN J. "BA E T, QF'SAN'IERANGISCQ onn ronn e;

TIMER.

Specification of Letters Patents atented Aug. 12, 1919;

Application filed October 24, 1916. Serial No. 127,377.

To all whomz't may concern 7 Be it known that I, MORRISSON J. BA NE T, acitizen of the United States, residing at San Francisco, in the countyof San Fran cisco and State of California, haveinventcd new and usefulImprovements in Timers, of which the following is a specification, V

The present invention relates to improvements in timing devices, such asare used for timing the exposures of photographic cameras, one object ofthe invention being to provide a device of this character which will becompact in form, and. simple and inexpensive in construction. A furtherobject is to provide a needle valve, which can be accurately adjustedsoas to regulate the rate of flow of the fluid past thevalve, which willafford an excellent indication of said rate of flow, which, when set,will not move from the position to which it'has been adjusted, and whichwill be provided with means for limiting the extent of adjustment.

In theaccompanying drawing, Figure l is an end view of my improvedtiming device in its position before the commencement of the operationof'timing; Fig. 2 is a longitudinal section of=the same in the sameposition; Fig. 3 is a view of the otherv end of said timing device insaid position; Fig. 4 is an end View of the timing device in itsposition at the end of said operation of tim.- ing; Fig. 5 is a brokenside viewof the same; Fig. 6 is a view similar to Fig-4 showing thetiming device attached to a camera, the latter being shown as broken;Fig. 7is a side view of the same; Fig. 8 is a broken:

side view of a cable release; Fig. 9 is a side view, on a small scale,showing the timing device attachedto the camera in a manner differentfrom that in Fig. 7

Referring to the drawing, 1 indicates a cylinder, of which one end ispressed inwardly and back on itself to form a double wall 2, then aclosed end 3, and then, around the center of said closed end, anoutwardly extending cylindrical wall a, threaded on its inner surface toreceive the threaded portion 5 of a needle valve tending through aminute hole in the center of the closed end. Secured tothe outer end ofsaid threaded portion 5 is a double pointer 7 of spring metal, the endsof which are, by the screwing in of said needle valve, pressed againstthe rounded outer edge of the double wall, said double pointer thusacting as a friction device to lock said valve, holding it 6, saidneedle valve exfirmly any position to Which it may have been adgustediSoldered or otherwise securedto the inner side of said double wallis apin 8, forminga stop for the double pointer .7, the parts being soarrangedthat, when one end ofthe pointer is stopp ed by said pin, asshown in Fig. 3, the minute hole is completely closed by the needlevalve. On the innersurface of tlie double wall is marked a circularseriesof equally. spaced lines 9 indicating to hasbeen opened. 7

The other end of the cylinder is closedby a head 11, held in place bythe metal at said end of the cylinder being. swage d around the edge ofsaid head. Said head is formed wltha central non circular aperture 12 inthe present instance shown as a square aperture, best shown in Fig. 1.Through said aperture extends astem 13, theinner end of which. isthreaded, as shown at 14:, said threaded end passingthrough a plunger 15consisting of leather cup 17, thena metal disk 18, there being. finallyscrewed upon said threaded end the inner end of a nut-19,.the outerend-of said nut forminga stop abutting against the closed end around theneedle valve and preventing the needle valve coming in contact with theinner end ofthe stem 13. Around the inner portion of the'stein is coileda spring.20 compressed between, the plunger 15 and the head 11 a oftheflcylinder, when the stem is drawn outward as far as possible. Theouter: endofrthe stem is in cross section ofform corresponding to thatof the aperture .12, that is, in the present instance, square, so that,when turned in any one of four positions, the stem can slide through theaperture 12, but when turned out of those positions, the inner end ofthe outer portion forms a shoulder, resting against the head 11 of thecylinder and preventing the inward movement of the stem and plunger. Theextreme outer terminal portion of the stem is bent at right angles, asshown at 21, thus forming a convenient handle for drawing out the stemagainst the pressure of the spring. Adjacent to the plunger when in itsoutermost position there is formed through the wall of the cylinder, asmall hole 22, through which air can enter the cylinder when said stemhas been drawn outwardly to its full extent.

Soldered or otherwise secured to the cylinder near the end closed by thehead 1l,'and

NT orrron. H

what extent the valve extending outwardly from said cylinder is a clipor holder 23 comprising two yokes 24: 0 spring metal, the free edges ofwhich yokes converge toward each othe In these yokes can be inserted ahead 25 of a casing 26 of a release rod 27 which is connected to a cable28 of a camera shutter. The handle 21 when turned from the positionshown in Fig. 1 to the position shown in Fig. 1, can form a pressure armto engage the head 29 of the rod 27, and, when the spring 20 is allowedto expand, the head 29 of the release rod 27 will be moved in the properdirection to operate the release rod 27 to make an exposure of thecamera, to the shutter of which the cable 28 is attached.

In the form of the invention shown in Figs. 6 and 7, the cylinder 1 isattached to a camera 30 by a spring clip 31, and the handle 21 engages alever 32 of well known construction to cause an exposure of the camera.

In Fig. 9 the cylinder is shown as attached to the shutter of the cameraby a band 33, and the handle 21 engages a well known form of lever 34:for operating the camera shutter.

I claim 1. In combination with a needle valve, a partition having anaperture adapted to be closed by said valve, a threaded casing in whichsaid needle valve is screwed, and a wall remote from said casing, and astraight double-ended pointer attached to said needle valve and havingboth of its ends movably and frictionally engaging said wall.

2. In a timing device, the combination of a cylinder having a ventaperture, a plunger therein, a stem therefor, said cylinder having ahole through which said stem passes, the outer portion of the stem beingcross-sectionally of a form such that it can Copies of this patent maybe obtained for five cents each, by addressing the pass through saidhole when in one position, but cannot pass therethrough when turnedabout its axis from said position, and a spring pressing said stemagainst said plunger.

3. In a timing device, the combination of a cylinder having a ventaperture, a plunger therein, a stem therefor, said cylinder having ahole through which said stem passes, the outer portion of the stem beingcrosssectionally of a form such-that it can pass through said hole whenin one position, but cannot pass therethrough when turned about its axisfrom said position, and a spring pressing said stem against saidplunger, the outer terminal portion being bent to form a handle andpressure ar 4:. In a timing device, the combination of a cylinder having.a vent aperture, a plunger therein, a stem therefor, said cylinder holethrough which said stem having a passes, and a sprlng pressmg sa1d stemagainst said plunger, the outer terminal ortion carrying a pressure armand the cy inder being provided with a stationary holder for holding thecasing of a cable release rod adapted to be actuated by said pressurearm.

5. In a timing device, the combination of a cylinder having a ventaperture, a plunger therein, a stem therefor, said cylinder having ahole through which said stem passes, and a spring pressing said stemagainst said plunger, the outer terminal portion carrying a pressure armand the cylinder being provided with a spring clip consisting of twospring yokes having converging free edges for holding the casing of acable release rod adapted to be actuated by said pressure arm.

MORRISSON J. BARNETT.

Commissioner of Patents,

Washington, D. 0.

